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[POWERPC] 4xx: Add mfspr/mtspr inline macros to 4xx bootwrapper

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The 4xx bootwrapper occasionally needs to access SPR registers,
this adds mfspr/mtspr wrappers to it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
This commit is contained in:
Benjamin Herrenschmidt 2007-12-21 15:39:32 +11:00 committed by Josh Boyer
parent d23f509929
commit ee41eea947
1 changed files with 8 additions and 0 deletions
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8
arch/powerpc/boot/reg.h
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@ -16,6 +16,14 @@ static inline u32 mfpvr(void)
return pvr;
}
#define __stringify_1(x) #x
#define __stringify(x) __stringify_1(x)
#define mfspr(rn) ({unsigned long rval; \
asm volatile("mfspr %0," __stringify(rn) \
: "=r" (rval)); rval; })
#define mtspr(rn, v) asm volatile("mtspr " __stringify(rn) ",%0" : : "r" (v))
register void *__stack_pointer asm("r1");
#define get_sp() (__stack_pointer)